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Updated: May 7, 2026
Diffusion Tensor Magnetic Resonance Imaging in the Analysis of Neurodegenerative Diseases
Published on: July 28, 2013
Quantitative evaluation of changes in the selected white matter tracts using diffusion tensor imaging in patients
A Zimny1, P Szewczyk, J Bladowska
1Department of General and Interventional Radiology and Neuroradiology, Wroclaw Medical University; Wroclaw, Poland - abernac@wp.pl.
Abstract:
This study evaluated the damage to the extensive range of white matter tracts in patients with Alzheimer's disease (AD) and mild cognitive impairment (MCI). Thirty-four patients with AD (mean age 71.5 yrs, MMSE 17.6), 23 patients with MCI (mean age 66 yrs, MMSE 27.4) and 15 normal controls (mean age 69 yrs, MMSE 29.8) were enrolled. Diffusion tensor imaging (DTI) was performed in 25 directions on 1.5 T MR scanner. Fractional anisotropy (FA) values were obtained with a small ROI method in several association tracts including posterior cingulum fibers, in commissural tracts (genu and splenium of corpus callosum) and projection tracts (middle cerebellar peduncles and posterior limbs of internal capsules). In MCI significant reductions of FA were found in the inferior longitudinal fascicles, left superior longitudinal fascicle and posterior cingulum fibers compared to normal controls. In AD significantly decreased FA values were detected in the same fascicles as in MCI and additionally in inferior fronto-occipital tracts and commissural tracts. In both AD and MCI the most severe changes were found within posterior cingulum fibers. No abnormalities were detected in projection tracts in both groups. Accuracy of DTI in detecting AD and MCI reached 0.95 and 0.79, respectively. FA measurements strongly correlated with neuropsychological tests. DTI is capable of depicting microstructural changes within white matter fiber tracts in dementia and may aid the differential diagnosis of AD and MCI.
Insights
Diffusion tensor imaging (DTI) reveals white matter damage in Alzheimer's disease (AD) and mild cognitive impairment (MCI). Posterior cingulum fibers show the most severe changes, aiding differential diagnosis.
Area of Science:
- Neuroimaging
- Neurology
- Radiology
Background:
- Alzheimer's disease (AD) and mild cognitive impairment (MCI) are associated with white matter abnormalities.
- Understanding the extent and location of white matter tract damage is crucial for diagnosis and prognosis.
Purpose of the Study:
- To evaluate white matter tract damage in patients with AD and MCI using diffusion tensor imaging (DTI).
- To assess the diagnostic accuracy of DTI in differentiating AD and MCI from normal controls.
- To correlate microstructural changes with cognitive function.
Main Methods:
- Diffusion tensor imaging (DTI) was performed on 34 AD patients, 23 MCI patients, and 15 normal controls.
- Fractional anisotropy (FA) values were measured in various white matter tracts, including association, commissural, and projection tracts.
- Neuropsychological tests were conducted to assess cognitive function.
Main Results:
- MCI patients showed reduced FA in inferior longitudinal fascicles, left superior longitudinal fascicle, and posterior cingulum fibers compared to controls.
- AD patients exhibited decreased FA in the same tracts as MCI, plus inferior fronto-occipital tracts and commissural tracts.
- Posterior cingulum fibers demonstrated the most severe microstructural changes in both AD and MCI groups.
- DTI achieved diagnostic accuracies of 0.95 for AD and 0.79 for MCI, with FA values correlating strongly with neuropsychological test results.
Conclusions:
- DTI effectively depicts microstructural white matter changes in AD and MCI.
- The posterior cingulum is a key area affected in both conditions.
- DTI shows promise as a tool to aid in the differential diagnosis of AD and MCI.
